It was to define the boundaries of Europe after WW2 and to limit the number of nuclear weapons held by the superpowers. It was also to negotiate an end to the Vietnam war. :)
Song dynasty is the answer
The U.S never helped aid Mao
It was used to make energy like Wifi and lights and for the solar is like solar power people use these that have boats or sertain cars but also energy sources use solar power that has made our world a bit better in energy but could use a few fixis. Hope this helped
